Supply-air wall duct

ABSTRACT

The invention relates to a supply-air wall duct ( 1 ), for installation in a building wall ( 7 ) to be provided with ducting, with a wall outside ( 71 ) and a wall inside ( 72 ), with a channel ( 2 ) with an outside end ( 21 ) sucking in the outside air at the wall outside ( 71 ) and with an inside end ( 22 ) for delivering the sucked-in air at the wall inside ( 72 ) to a heat-producing appliance/internal combustion engine ( 8 ) located in an inner region behind the wall ( 7 ), there being provided in the channel ( 2 ) at least one flap ( 31, 32 ) or lamella, by means of which the channel ( 2 ) can be closed for the supply air fed from outside, wherein an actuating device ( 6 ) which actuates the flap(s) ( 31, 32 ) or the lamella(s) is provided, wherein the channel ( 2 ) delivers the sucked-in air at its inside end ( 22 ), and that at least one bypass opening ( 91   b,    92   b ) which opens into the inner region and has bypass closure device(s), in particular bypass flap(s) ( 91, 92 ), is/are disposed on an inside end portion ( 4 ) of the channel ( 2 ), wherein the actuating device ( 6 ) is coupled mechanically with the bypass flap(s) ( 91, 92 ) in such a way that the bypass flap(s) ( 91, 92 ) is/are opened or closed, just as the at least one flap(s) ( 31, 32 ) or lamella(s) in the channel ( 2 ) are conversely closed or opened in the opposite direction thereto.

The invention relates to a supply-air wall duct, for installation in a building wall to be provided with ducting, with a wall outside and a wall inside, with a channel with an outside end sucking in the outside air at the wall outside and with an inside end for delivering the sucked-in air at the wall inside to a heat-producing appliance/internal combustion engine located in an inner region behind the wall, there being provided in the channel at least one flap or lamella, by means of which the channel can be closed for the supply air fed from outside, wherein an actuating device which actuates the flap(s) or the lamella(s) is provided.

A supply-air wall duct with a flap disposed in a channel is known from DE 10 2011 011 772 A.

On account of the highest possible energy efficiency, modern houses are now designed so air-tight that the air supply from the exterior leads to problems, since the tightness of the house stops the air exchange precisely in order to save energy.

Incoming and outgoing ventilation accesses through the masonry are therefore required in order, for example, to supply fresh air to fireplaces or heat-producing appliances located inside the house and also to internal combustion engines and exhaust air systems located in the building.

Chimney stoves in the housing sector are for example becoming increasingly popular. The through-draft of chimney stoves requires a corresponding fresh air access for the combustion process, which is continued thereafter through the chimney.

In the case of particularly air-tight buildings, chimney stoves therefore can and in some cases must be connected by a wall duct to the outside air.

Without a flap closing the supply-air channel when the stove is not in use, however, cooling of the combustion air line or the complete stove and therefore the inner region behind the wall occurs. This has unfavourable consequences for the energy balance of a low-energy house, because the stove thus represents a cold source in the insulated building.

It is problematic, however, when such supply air channels with flaps are incorrectly operated, i.e. for example if it is forgotten to open the flap when the chimney stove is heated in the dwelling or if children who are playing close in the flap. Dangerous situations can then arise, in which an adequate air supply is no longer ensured.

The problem of the invention is to make available an improved supply-air wall duct, wherein continuous safeguarding of a sufficient air flow is guaranteed.

This problem is solved by a supply-air wall duct according to the features of claim 1.

According to the invention, a supply-air wall duct is provided, for installation in a building wall to be provided with ducting, with a wall outside and a wall inside, with a channel with an outside end sucking in the outside air at the wall outside and with an inside end for delivering the sucked-in air at the wall inside to a heat-producing appliance/internal combustion engine located in an inner region behind the wall, there being provided in the channel at least one flap or lamella, by means of which the channel for the supply air fed from outside can be closed, wherein an actuating device which actuates the flap(s) or the lamella(s) is provided, which supply-air wall duct is characterised in that the channel delivers the sucked-in air at its inside end, and that at least one bypass opening which opens into the inner region and has bypass closure device(s), in particular bypass flap(s), is/are disposed on an inside end portion of the channel, wherein the actuating device is coupled mechanically with the bypass flap(s) in such a way that the bypass flap(s) is/are opened or closed, just as the at least one flap(s) or lamella(s) in the channel are conversely closed or opened in the opposite direction thereto.

The flap(s) and bypass flap(s) are therefore connected to one another via a mechanism in such a way that all the flaps are always moved. The possibility of the user being able to move only one flap individually or not all the flaps is eliminated. Through the operator control, the flap(s) of the outside air and the bypass flap(s) of the inside air are always moved together. The mechanism thus functions in such a way that the flaps of the outside and inside air work in opposite directions.

All the flaps being closed or the flaps being opened as a result of any movement/operator control or another action is thus ruled out.

Within the sense of the invention, the channel can have a round or angular cross-section or a cross-section adapted to the circumstances of the application.

According to a preferred embodiment of the invention, provision is made such that the channel has a defined opening with D at its inside end for the delivery of the sucked-in air, wherein the bypass opening(s) which open into the inner region has/have (together) at least 70%, preferably 100%, of defined opening width D of the channel.

The channel can be advantageously coupled to the heat-producing appliance/internal combustion engine at its inside end by means of further extensions or by means of a reduction piece. In this respect, defined opening width (D) can be defined by the cross-section of the extension or by the reduction piece as a prolongation of the channel.

Provision is advantageously made such that the actuating device can be actuated by an electromotive actuator preferably provided for this purpose or manually by an operator element disposed on the inside end portion and projecting outwards through the latter.

The actuating device is preferably coupled mechanically by a linkage with the flap(s) or lamella(s) inside the channel.

Provision is advantageously made such that the actuating device is coupled mechanically by a linkage with the bypass flap(s) inside the channel.

The linkage of the flap(s) is advantageously constituted symmetrical and is attached to two attachment points located on the flap spaced apart from the swivel pin of the flaps.

Provision can also advantageously be made such that the linkage of the bypass flap(s) is constituted twofold, in particular symmetrically, and is attached to two points located on the flap spaced apart from the swivel pin of the bypass flap(s).

To improve the thermal sealing, two flaps coupled mechanically with one another in parallel are provided in the supply air path one behind the other in the channel.

A preferred development of the invention makes provision such that the flap(s) and bypass flap(s) are mounted swivellable or rotatable on swivel pins mounted in the channel.

According to a further embodiment, provision can also thus be made such that at least one spring is disposed on the swivel pins of the bypass flap(s) or the flap(s), said spring(s) being pretensioned in such a way that the flap(s) can be held in the “open” position or be brought into this position and the bypass flap(s) can be held in the “closed” position or can be brought into this position.

An advantageous variant to the invention makes provision such that opening width D of the bypass opening(s) amounts to at least 30 square centimetres. Sufficient ventilation is thus ensured.

According to an advantageous development, provision is made such that an arresting element is provided for fixing the operator element or the actuating device or the flap(s) or bypass flap(s), said arresting element permitting fixing only in two end positions as in the position of the flaps as “completely opened” or “completely closed”.

An optimum adaptation to the channel on the one hand and a heat-producing appliance/internal combustion engine disposed behind the latter can also take place according to a further embodiment of the invention by the fact that the end piece of the inside end portion of the channel is constituted as a pipe extension piece and is constituted as an add-on part onto the inside end portion, wherein the axis of the channel has a selectable offset with respect to the axis of the pipe extension piece.

Further advantageous embodiments emerge from the further sub-claims or their possible sub-combinations.

The invention is explained in greater detail below with the aid of the drawings. In the diagrammatic representation, in detail:

FIG. 1 shows a diagrammatic view of a supply-air wall duct according to the invention with opened bypass flaps,

FIG. 2 shows the supply-air wall duct from FIG. 1 installed in a wall in a diagrammatic cross-section representation, with closed bypass flaps (flaps opened in the channel),

FIG. 3 shows the supply-air wall duct from FIG. 2 installed in a wall, with opened bypass flaps (flaps closed in the channel),

FIG. 4 shows the supply-air wall duct from FIG. 1 in a diagrammatic partial cross-sectional representation with closed bypass flaps,

FIG. 5 shows the supply-air wall duct from FIG. 4 from another viewing angle,

FIG. 6 shows the supply-air wall duct according to FIG. 4 with opened bypass flaps in a diagrammatic partial cross-sectional representation,

FIG. 7 shows the supply-air wall duct from FIG. 6 from another viewing angle,

FIG. 8 shows a diagrammatic view of the supply-air wall duct with an opened inside end portion with a view onto the actuating device and a spring of a bypass flap,

FIGS. 9 to 11 show a detail representation of the operator element in cooperation with the arresting element in different positions,

FIGS. 12 to 14 show the supply-air wall duct with removed extension piece and add-on parts according to two different variants for adaptation to the position of an air admission of a stove, and

FIG. 15 shows a supply-air wall duct according to the invention with a channel extension and a grid fixture in the installed state in a wall with a chimney stove connected thereto.

The same reference numbers in the figures denote the same or similarly acting elements.

FIG. 1 represents a side view of a supply-air wall duct 1 with an opened bypass flap 91 b as a bypass closure device.

Supply-air wall duct 1 comprises a channel 2, which can be closed by means of flaps 31 and 32 for the supply air fed in from outside, wherein an actuating device 6 which actuates flaps 31, 32 is provided. In the example shown, said actuating device is actuated by an electromotive actuator preferably provided for this purpose or manually by an operator element 64 disposed on inside end portion 4 and projecting outwards through the latter.

As can be seen from FIG. 2 in the installed state through a wall 7, an outside end portion 3 of channel 2 is located inside the wall from wall outside 71 to inside end portion 4 of channel 2, which projects from wall inside 72 into the interior. The outside air is sucked in through outside end 21 at wall outside 71 and is delivered at an inside end 22 to a heat-producing appliance/internal combustion engine located behind wall 7 in an inner region.

Channel 2 delivers the sucked-in air at its inside end 22. In the example shown, there are located at an inside end portion 4 of channel 2 two bypass openings 91 b, 92 b with bypass flaps 91, 92 which close the latter, said bypass openings opening into the inner region.

For better thermal installation, two flaps 31 and 32 coupled mechanically with one another in parallel are disposed in the supply air path one behind the other in channel 2.

At its inside end 22 for delivering the sucked-in air, channel 2 has a defined opening width D, wherein bypass openings 91 b, 92 b opening into the inner region together comprise, in the example shown, 100% (D/2+D/2=D) of defined opening width D of channel 2.

An actuating device 6 is coupled mechanically with bypass flaps 91, 92 in such a way that bypass flaps 91, 92 are opened or closed, just as flaps 31, 32 in channel 2 are conversely closed or opened in the opposite direction thereto.

FIG. 2 also shows a grid fixture 24 disposed at outside end 21 of channel 2. This grid fixture serves to keep out small parts or animals.

Actuating device 6 is coupled mechanically by a linkage 61, 62 to flaps 31, 32 inside channel 2. Furthermore, actuating device 6 is also coupled mechanically by a further linkage 93, 94 to bypass flaps 91, 92 inside channel 2.

FIG. 3 shows the supply-air wall duct from FIG. 2 installed in a wall with opened bypass flaps. It can clearly be seen here that, in the example, linkage 61, 62 of flaps 31, 32 is constituted symmetrical and is attached to two attachment points 35, 36 located on the flap spaced apart from swivel pin 33, 34 of flaps 31, 32.

Linkage (93, 94) of bypass flaps (91, 92) is also constituted twofold symmetrically and is attached to two points (93 a, 94 a) located on the flap spaced apart from the swivel pin (95, 96) of the bypass flaps (91, 92). The flaps (31, 32) and bypass flaps (91, 92) are mounted swivellable or rotatable on swivel pins (33, 34, 95, 96) mounted in the channel (2).

The interaction of the actuating device (6) with the linkages 61, 62 and 93, 94 can be seen in greater detail from the partial cross-sectional representations according to FIGS. 4 to 7.

FIG. 5 also shows springs 98, 99 disposed on swivel pins 95, 96 of bypass flap(s) 91, 92. Said springs are pretensioned in such a way that bypass flaps 91, 92 and flaps 31, 32 are held in the “closed” position or are brought into said position.

Thus, for example, the problem exists of outside air passing through an incompletely closed inside air flap into the room and not into the stove system. The effect of this would be that the room would cool down. Cold bridges into the room. For this reason, it is ensured by means of springs that the inside air flaps are always automatically closed.

The effect of this in turn is, of course, that the outside air flaps are always brought into the “opened” position.

In order to prevent undesired automatic opening of flaps 31, 32 by springs 98, 99, an arresting element 65 is provided for fixing operator element 64 and therefore actuating device 6. Flaps 31, 32 and bypass flaps 91, 92 controlled thereby via the linkage are thus fixed.

This is explained in greater detail in FIGS. 8 to 11.

As a result of a form-fit structure of arresting element 65 interacting with operator element 64, fixing only in two end positions as the position of the flaps as “completely opened” or “completely closed” is ensured.

The tractive force of the springs ensures additional arresting.

If the operator incorrectly locks home operator element 64 due to faulty operation, the grip and therefore the flaps always shift back—due to the spring force—to the desired operationally reliable initial positions, i.e. outside air completely open, inside air—through the bypass flaps—completely closed.

Finally, FIGS. 12 to 14 show yet another advantageous variant of the invention for adapting to stoves in which the channel-axis is not symmetrical.

Accordingly, the end piece of inside end portion 4 of channel 2 is constituted as a pipe extension piece 42 and as an add-on part 43 onto inside end portion 4, wherein the axis of channel 2 has a selectable offset with respect to the axis of pipe extension piece 42.

FIG. 13 shows an add-on part 43 with a pipe extension piece 42 offset with respect to the channel axis; the variant according to FIG. 14 shows an add-on part 43 with pipe extension piece 42 aligned with respect to the channel axis.

FIG. 15 finally shows an example with an assembled chimney stove 8, which carries away through outgoing-air stove pipe opening 81 the air flow which is sucked in through channel 2 extending through wall 7. In the example shown, bypass flaps 92 are also adapted to the curvature of inside end portion 4 of channel 2 constituted as a pipe.

LIST OF REFERENCE NUMBERS

-   1 supply-air wall duct -   2 channel -   21 outside end -   22 inside end -   24 grid fixture -   3 outside end portion -   31, 32 flap -   33, 34 swivel pin -   35, 36 attachment point -   38 axis -   4 inside end portion -   42 pipe extension piece -   43 add-on part -   43 a, 43 b add-on part -   6 actuating device -   61, 62 linkage -   64 operator element -   65 arresting element -   7 wall -   71 outside -   72 inside -   8 chimney stove -   81 outgoing-air stove pipe opening -   91, 92 bypass flap -   91 b, 92 b bypass opening -   93, 94 linkage -   93 a, 94 a attachment point -   95, 96 swivel pins -   98, 99 spring -   D defined opening width 

1. A supply-air wall duct, for installation in a building wall to be provided with ducting, with a wall outside and a wall inside, with a channel with an outside end sucking in the outside air at a wall outside and with an inside end for delivering the sucked-in air at the wall inside to a heat-producing appliance/internal combustion engine located in an inner region behind the wall, there being provided in the channel at least one flap or lamella, by means of which the channel can be closed for the supply air fed from outside, wherein an actuating device which actuates the flap(s) or the lamella(s) is provided, wherein the channel delivers the sucked-in air at its inside end, and that at least one bypass opening which opens into the inner region and has bypass closure device(s), in particular bypass flap(s), is/are disposed on an inside end portion of the channel, wherein the actuating device is coupled mechanically with the bypass flap(s) in such a way that the bypass flap(s) is/are opened or closed, just as the at least one flap(s) or lamella(s) in the channel are conversely closed or opened in the opposite direction thereto.
 2. The supply-air wall duct according to claim 1, wherein the channel has a defined opening width at its inside end for the delivery of the sucked-in air, wherein the bypass opening(s) which open into the inner region has/have (together) at least 70%, preferably 100%, of the defined opening width of the channel.
 3. The supply-air wall duct according to claim 1, wherein the actuating device can be actuated by an electromotive actuator preferably provided for this purpose or manually by an operator element disposed on the inside end portion and projecting outwards through the latter.
 4. The supply-air wall duct according to claim 1, wherein the actuating device is coupled mechanically by a linkage with the flap(s), or lamella(s) inside the channel.
 5. The supply-air wall duct according to claim 1, wherein the actuating device is coupled mechanically by a linkage with the bypass flap(s) inside the channel.
 6. The supply-air wall duct according to claim 4, wherein the linkage of the flap(s) is constituted symmetrical and is attached to two attachment points located on the flap spaced apart from the swivel pin of the flaps.
 7. The supply-air wall duct according to claim 5, wherein the linkage of the bypass flap(s) is constituted twofold, in particular symmetrically, and is attached to two points located on the flap spaced apart from the swivel pin of the bypass flap(s).
 8. The supply-air wall duct according to claim 1, wherein two flaps coupled mechanically with one another in parallel are provided in the supply air path one behind the other in the channel.
 9. The supply-air wall duct according to claim 1, wherein the flap(s) and bypass flap(s) are mounted swivellable or rotatable on swivel pins mounted in the channel.
 10. The supply-air wall duct according to claim 9, wherein at least one spring is disposed on the swivel pins of the bypass flap(s) or the flap(s), said spring(s) being pretensioned in such a way that the flap(s) are held in the “open” position or are brought into this position and the bypass flap(s) are held in the “closed” position or are brought into this position.
 11. The supply-air wall duct according to claim 1, wherein the opening width of the bypass opening(s) amounts to at least 30 square centimetres.
 12. The supply-air wall duct according to claim 1, wherein an arresting element is provided for fixing the operator element or the actuating device or the flap(s) or bypass flap(s), said arresting element permitting fixing only in two end positions as the position of the flaps as “completely opened” or “completely closed”.
 13. The supply-air wall duct according to claim 1, wherein the end piece of the inside end portion of the channel is constituted as a pipe extension piece and is constituted as an add-on part onto the inside end portion, wherein the axis of the channel has a selectable offset with respect to the axis of the pipe extension piece. 